Answer:
reinforced
Explanation:
The teacher reinforces or stimulates the behavior of Andy by praising him for answering questions.
The behaviours that are desired: like answering and participating in class, are commonly taught as reinforced behaviors since they enable a student or a person to follow into the desired goal: to learn and to pass the exams.
Since Andy gets praised every time that he participates answering, it is likely also that he will develop confidence over time, and become much more sociable than those peers that prefer to stay silent.
Reinforced behavior will always be the natural opposite to negative reinforcment, like a punishment.